In addition, there are some old skins I have downloaded previously, but are no longer available at kGE website. The Mouse Skin has a translucent cooling blue layer as displayed in the screenshot below. The classic v2.9 Default Skin is also available for v3.x clients. You may also want to try out Blossom Skin and Black Skin.

I didn't make these skins. Credit goes to whoever created the skins, whoever they may be...